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彼女の冗談は

her jokes

→ 彼女
phrase Rare #40,598
her jokes は marks the phrase as the topic of the sentence.
JA: 彼女の冗談はいつも面白い。
EN: Her jokes are always funny.

彼に彼女の冗談は通じなかった。

He didn't get her joke.

彼女の冗談は笑わずにはいられない。

You can't help laughing at her jokes.